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Avoid querying DNS seeds, if we have open connections.

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The goal is to increase independence and privacy.
This commit is contained in:
Jeff Garzik 2014-07-29 11:04:46 -04:00
parent 2920322871
commit 2e7009d67b
2 changed files with 14 additions and 1 deletions
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3
src/init.cpp
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@ -240,7 +240,8 @@ std::string HelpMessage(HelpMessageMode mode)
strUsage += " -connect=<ip> " + _("Connect only to the specified node(s)") + "\n"; strUsage += " -connect=<ip> " + _("Connect only to the specified node(s)") + "\n";
strUsage += " -discover " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n"; strUsage += " -discover " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n";
strUsage += " -dns " + _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + _("(default: 1)") + "\n"; strUsage += " -dns " + _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + _("(default: 1)") + "\n";
strUsage += " -dnsseed " + _("Find peers using DNS lookup (default: 1 unless -connect)") + "\n"; strUsage += " -dnsseed " + _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect)") + "\n";
strUsage += " -forcednsseed " + _("Always query for peer addresses via DNS lookup (default: 0)") + "\n";
strUsage += " -externalip=<ip> " + _("Specify your own public address") + "\n"; strUsage += " -externalip=<ip> " + _("Specify your own public address") + "\n";
strUsage += " -listen " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n"; strUsage += " -listen " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n";
strUsage += " -maxconnections=<n> " + _("Maintain at most <n> connections to peers (default: 125)") + "\n"; strUsage += " -maxconnections=<n> " + _("Maintain at most <n> connections to peers (default: 125)") + "\n";

12
src/net.cpp
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@ -1221,6 +1221,18 @@ void MapPort(bool)
void ThreadDNSAddressSeed() void ThreadDNSAddressSeed()
{ {
// goal: only query DNS seeds if address need is acute
if ((addrman.size() > 0) &&
(!GetBoolArg("-forcednsseed", false))) {
MilliSleep(11 * 1000);
LOCK(cs_vNodes);
if (vNodes.size() >= 2) {
LogPrintf("P2P peers available. Skipped DNS seeding.\n");
return;
}
}
const vector<CDNSSeedData> &vSeeds = Params().DNSSeeds(); const vector<CDNSSeedData> &vSeeds = Params().DNSSeeds();
int found = 0; int found = 0;